Hello,
I have played around with the ttl option and I can confirm that it does NOT work.
The problem is that when the lokijs collection is created, you do it like this:

        self.collection = self.client.addCollection('Sessions', {
          indices: ['sid'],
          ttlInterval: self.ttl
        })

... which is wrong because you are setting the check interval, but you are not specifying the age.
Also, the connect-loki ttl option is supposed to be in seconds whereas the ttlInterval is in milliseconds.
So the correct way to initialize the collection should be:

        self.collection = self.client.addCollection('Sessions', {
          indices: ['sid'],
          ttl: self.ttl*1000,            // age
          ttlInterval: 5000       // interval (equal to autosaveInterval)
        })

I have tested the above configuration and it does work as expected.
Please check it yourself and let me know how it goes.
Thanks!
Alex

Some times Below Error happening and I couldn't know what is the problem. can you please check.

TypeError: Cannot read property 'find' of undefined
at LokiStore.get (C:\node_modules\connect-loki\lib\connect-loki.js:98:29)
at session (C:\node_modules\express-session\index.js:481:11)
at Layer.handle [as handle_request] (C:\node_modules\express\lib\router\layer.js:95:5)
at trim_prefix (C:\node_modules\express\lib\router\index.js:317:13)
at C:\node_modules\express\lib\router\index.js:284:7
at Function.process_params (C:\node_modules\express\lib\router\index.js:335:12)
at next (C:\node_modules\express\lib\router\index.js:275:10)
at expressInit (C:\node_modules\express\lib\middleware\init.js:40:5)
at Layer.handle [as handle_request] (C:\node_modules\express\lib\router\layer.js:95:5)
at trim_prefix (C:\node_modules\express\lib\router\index.js:317:13)
at C:\node_modules\express\lib\router\index.js:284:7
at Function.process_params (C:\node_modules\express\lib\router\index.js:335:12)
at next (C:\node_modules\express\lib\router\index.js:275:10)
at query (C:\node_modules\express\lib\middleware\query.js:45:5)
at Layer.handle [as handle_request] (C:\node_modules\express\lib\router\layer.js:95:5)
at trim_prefix (C:\node_modules\express\lib\router\index.js:317:13)

In connect-loki/lib/connect-loki.js:

1. Promise = require('bluebird')//it is unused. It can be safely removed from code.
2. You use only noop and isNill from loadash. But what is the reason to load hole loadash for this simple function and also add additional dependency? noop = function () {} and isNill = obj === null.
   So in package.json you can remove

"dependencies": {
    "bluebird": "^3.4.1",
    "lodash": "^4.15.0",
}

3. What is the reason always pass to the function callpack functuion as a parameter? Like:

	LokiStore.prototype.clear = function (fn) {
		if(!fn) { fn = _.noop; }
		this.collection.clear();
		fn(null);
	};

I would make it more cleaner:

	LokiStore.prototype.clear = function () {
		return this.collection.clear();
	};

Because I guess "clear" method is synchronous and you don't need callback there.
So
lokiStore.clear(callback)
can be easily be rewritten to:

lokiStore.clear();
callback();

when i am trying to destroy a session (store.destroy ) with following code
route.js

30   var store=req.sessionStore;
31   store.destroy(sessionID, function(error){
32      logger.info("Session destroyed");
33      res.end();
30  });

i am getting this error

Error: Object is not a document stored in the collection
   at LokiEventEmitter.Collection.remove (/home/rohith/workspace/express/SelfcareServer/node_modules/lokijs/src/lokijs.js:4112:15)
   at LokiStore.client.loadDatabase.LokiStore.destroy (/home/rohith/workspace/express/SelfcareServer/node_modules/connect-loki/lib/connect-loki.js:151:19)
   at /home/rohith/workspace/express/SelfcareServer/modules/routes.js:31:13

Can somebody help me out this problem ?